Core RC Piston Drilling Kit - 1.5 - 2.2mm (8 Bits)Fine tuning of shock piston sizes has always been a tuning tool for the pro's. With this tool from Core RC its a simple task for any racer. This hand drill comes included with 8 different drill bits 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm and 2.2mm.For smaller sizes please see CR233 - Piston Drilling Kit-1.1-1.8mm (8 bits)