20pcs/Pack M4*5 Set Screw Pack Set for Timing Pulleys with 1pc Allen Key/Hex Wrench

Description:

• Set Screws are often used for holding a pulley, gear, or other parts from turning relative to a shaft.
• Do not have an external head.
• Drive system is a hexagon-shaped hole.

Grade 12.9, GB80 Hexagon socket set screws with cup point.

Material 45# carbon steel, for GT2 36 Teeth 5mm Bore and 8mm Bore Timing Pulleys.