Yoketool 11 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 Пяшчанік