Double-curved hickory handle DIN 5111 with an additional hardened steel handle protection sleeve, ring wedge, securing plate, and wood screw. With this standardized wooden handle DIN 5111, any DIN hammer head can be converted into a Rotband-Plus hammer. Here's how to do it: Drive the handle into the hammer head up to the sleeve. Tap the ring wedge into the designated hole. Tighten the securing plate with the screw on the hammer head.