Industrial screw clamp according to din 5117 screw clamp arms made from top quality tempered metal gtw 40 din 1692 glide tracks made from rack drawn hollow profile steel zincplated fluted on both sides din 1652 plastic protection caps prevent scratches and pressure points on work pieces thread spindle with trapezoidal thread din 103 burnished fluted plastic screw clamp and hardwood handle increase hold and power transmission