feed forked connection roller screw stub

load roller screw

para-screw roller refiner

roller screw pair

screw roller furnace

load roller mounting screw

roller mounting screw

Positioning Screw， Set Screw

right hand screw [= right handed screw]

screw hexagon socket head cap screw

roller-ball-roller

smooth roller and teeth roller

[screw] thread

3D screw method

90° side screw driver

a screw rod for transporting bottle

abnormal screw

Absorbabal screw

absorbable inner fixation screw