MILWAUKEE Bimetal holesaw set

15 teeth per inch: for clean cutting;0.6 mm thick: less resistance. 40% FASTER;Optimized for steel, aluminum (2 mm max) and stainless steel (1.5 mm max);1/4″ hex socket. Compatible with impact wrenches;Wide shoulder prevents over-sinking;Bi-Metal construction with 8% Cobalt for durability and high performance;Integrated spring for automatic material ejection;Ideal design for use with cordless impact wrenches and beyond. Extreme ease of one-handed drilling