About choosing big door handles, since national standard and general customers' knowledge of judging quality lack, most part of the handles in market are low-end, while dealers prefer to purchase cheap products at fire sale prices, and at last users suffer losses. So, we need have in mind about below aspects when we choose door handles to void the trouble in future.

First:Material.

1.Stainless steel.

Stainless steel pipe need to be thick, or it can be bumpped to be concave. When buy SS material it is suggested to use the method of touch and knock. If it is thin pipe when you hold it whose temprature will be the same with body's soon, opposite it is cold even you hold it for a long time compared with time of holding thin pipe. When you knock thick pipe the sound ringing, and sound for thin pipe will be depressive. DSM handles adopt the pipe with 1.2mm so many years.Some factories cheat customers by filling cement into the pipe. There are lots of grade for stainless steel,the price discrepancy is big also, try to choose AISI304 stainless steel manufactured by formal suppliers.

2.Brass,zinc alloy and aluminium etc.

DSM choose brass,zinc alloy and aluminium etc material to prdoduce handles according to different technics and shape.It need to be noted that if heavy strength need to bear, zinc alloy material can not be too thin or used as functional accessory. The Statistics for anti theft doors of certain residential subdistricts, above 60% handles with broken handle base after three years started from they moved in,the reason is that zinc alloy fitting too thin quality bad either.After surface treatment all material is difficult to realise the original material, so consumers need to clear about this point.

3.Nature stone,nature wood,plastic etc.

Material for handles there are still have a lot, and quality with good or bad, we won't describe here, don't hesitate to contact us if you are interested.

Second:Surface technics.

Handles are just as person's face, the grade of interior fitment can be seen from the surface treatment of handles. The cost of surface treatment sometimes can be more expensive than the cost of material, so the handles with good surface treatment the material will be better. Below aspects can show the surface treatment technics:

1.The polish effect of stainless steel like surface of mirror with clear cyan without spot or grain, if its color is nearly matt white the quality belong to lower grade. The SS with hairline finish, the grain need to be smooth, connection with mirror surface need to be level and vertical can not has hairiness.

2.The surface with electroplating need to note whether color is clear, whther have spot etc electroplating defect.

3.Shape whether perfect, good technics should be with angular, line regular, without burr or gap etc.

4.We DSM design producton line for polishing material with passel excellent polishing mechanics producing the first handles. Then electroplating technics with high quality strict request.

Third:The accessory's situation.

1.Good quality handles accessories' sizes are accurate, while handles with bad quality with big tolerance and rough machining. To realise the interior accessory's machining situation the handles need to be taken apart. The accessory for DSM handles mainly machined by numberical control equiptment, appearance fine, lines matched with screw full, handle fixed difficult to be loosen, durable.

2.The material for fittings is important also. Standard fiitings for good quality handles adopted stainless steel, copper or stainless steel material used for connection. Bad quality handles used for not a long time, interior will be rust badly, sometimes it is difficult to take apart the handles from doors.

3.It will take lots of time and money to get a suitable screw if handles can not be fixed due to a screw. So in order to solve this problem, bolt screw for door with thickness of 10mm-55mm and spare screw supplied by DSM for our handles.

Four:Other aspects.

1.The package for good handles will be formal with several protection, and handles of bad quality will be very simple.

2.Only checking brand is not enough, certificate of competency,factory address and telphone etc information is essential, once quality issue appear you can claim for compensation. DSM handles guaranteed to be used for two years, inspection number etc information issued on certificate of competency.