COMPATIBILITY: The Amtech Hex Arbour is specifically designed for use with Amtech Bi-metal holesaws ranging from 14mm to 30mm making it a versatile tool for various drilling tasks. EASY ATTACHMENT: This hex arbour is easily attachable and fits securely into drill chucks ranging from 3/8 inch to 1/2 inch ensuring broad compatibility with different drills. INCLUDES PILOT BIT: Comes complete with a removable 6mm pilot hole drill bit allowing for precise and effortless drilling every time. DURABLE AND RELIABLE: Engineered for durability this hex arbour is built to withstand the rigours of drilling through a variety of materials providing long-lasting performance. VERSATILE USE: Ideal for both professional tradespeople and DIY enthusiasts this arbour enhances the efficiency and accuracy of your drilling projects.