Material ：PU (Polyurethane)
Features: One side has a V-shaped groove in the horizontal direction, and the other side has a V-shaped groove in the vertical direction and 45 degrees. For objects with a concave-convex shape, it can also be closely fitted and fixed. Strong magnetic, easy to install on bench vise

Uses: used to protect the screw from being damaged when it is fixed on the vice

How to use: Install it on the bench vise, make the thread of the screw stick in the groove of the protection bar, and clamp the bench vise. The screw is in a fixed state, and one can independently perform screw maintenance.