Tools4Boards Spin 5 Piece Brass Kit is the result of several seasons of extensive testing with top level athletes and World Cup servicemen. Premium Spin German-made roto brushes are 115mm in length and 55mm in diameter. Included in the kit: professional grade Spin Snap-on Handle featuring all metal construction with integrated 1.25" diameter sealed cartridge bearing for smooth rotation. Changing brushes and rollers is a snap without removing Hex Drive from drill chuck Spin 10cm stainless steel Hex Drive compatible with Snap-on Handle and all Tools4Boards brushes and rollers SPIN Brass roto brush with 12.5mm length brass bristles - used as a first brush before waxing to open base structure and as a first brush after waxing to re-open base structure. SPIN Horsehair roto brush with 7mm length bristles for base brushing. SPIN Nylon roto brush with 7mm length bristles for final base buffing and polishing.