\(25\text{mm}\) (\(1"\)) thick. Includes: Five hole saws (\(64\text{mm}\), \(76\text{mm}\), \(89\text{mm}\), \(102\text{mm}\), \(127\text{mm}\)), a \(9.5\text{mm}\) (\(3/8"\)) mandrel with pilot drill, a drive plate, and a hex key wrench. Best Use: Ideal for DIY woodworking projects and soft materials, not recommended for metal or hardwood.