853/4 Harpoon ACR® bits
High quality bits with reduced shaft diameter for low-lying screw connections. Countersinking of screws without any surface damage. Come with rough ribs (anti cam-out feature, ACR) to prevent any slipping out of the screw head. Tough viscous for universal use. 1/4" hexagon, suitable for holders as per DIN ISO 1173-F 6.3.