diamond Core Drill Kit 3pce 3pceOverview3 top quality diamond core drill bits (28 x 300mm, 52 x 150mm and 107 x 150mm); SDS Plus arbor and hex arbor; 10mm taper guide drill bit and drift key. For dry drilling through brick and block. Reduced vibration. Not recommended or guaranteed for hammer action. Use with drills with safety clutch. Recommended for use with GMC SDS Plus Rotary Hammer Drill (920405) and GMC SDS Plus Rotary Hammer Drill (920378).