Our products adopts mild carbon alloy steel.According to the demand of customer, the    products can be divided into two levels:

1 

• Ordinery pull studs 
• high-quality pull studs

Both hardness is soft inside hard outside,and with high impact resistance.However,the latter is much better than the former ,it is more durable, threaded more accurate,and thread hardness is slightly low(can protect tool holder thread).The hilt hardness is high (more wear resistance ),longer service life,suitable for high-end tool holder.Of course,the ordinary one is a little cheaper than the high-quality one.

Considering the customer's preferences,we can provide diffrent colors of knobs:

• All-black (Left)
• White Thread (Right)
• Black Thread (Middle)

Furthermore,other non-standard knobs and knobs with O-rings  also can be manufactured.