3 types of hole diameter to meet different needs, 85 holes in total. 40 holes with diameter 1/8"; 30 holes with diameter 1/4"; 15 holes for 11.5mm ER11 collets. Made of high-quality EVA(Ethylene-vinyl acetate copolymer), the bit holder is extra durable and long-lasting. This compact box helps you group your bits, little gadgets and tools in order, making your workbench clear and neat. Open design allows quick bit change to remove or replace when working with CNC machines. Tips: In order to avoid injury when removing the router bits, please wear gloves when replacing the router bits, or place the router bits in reverse., Weight: 0.24912235606 Pounds, Manufacturer: Genmitsu