Rothenberger 12 piece Dry Diamond Core Drill Set offers the fastest and most cost effective solution for neatly and efficiently coring the most common sized holes (42, 52, 65, 117 & 127 mm) through the most popular building materials and soft to medium hard natural stones - such as: General Facing Brick Handmade Bricks Lightweight, General and Dense Concrete Blocks Concrete Paving & Patio Slabs York Stone Lime Stone Abrasive Sandstone Rothenberger 12 Piece Dry Diamond Core Drill Set comprising 5 of the most common size core drills for plumbing and general building work applications, supplied in a lockable aluminium tool case for added convenience. Kit Contents 42, 52, 65, 117 & 127mm core drills 3 Jaw chuck adaptor 3 Jaw extension 250mm SDS chuck adaptor SDS extension 250mm A-Taper guide rod Drift key Lockable aluminium tool case