The Bosch PRO 15 Piece Q-Lock Arbor Multi Material Hole Saw Set is a professional bi-metal hole saw kit designed for electricians, plumbers, and contractors who need a single versatile set for interior installation work. Built with 8% cobalt HSS alloy teeth, these hole saws last up to twice as long as standard HSS M3 hole saws, making them a cost-effective choice for trade professionals cutting regularly through mixed materials. The enhanced tooth design delivers fast, smooth cuts through steel cladding, drywall, and other common building materials. The Q-Lock arbor system is a standout practical feature, allowing rapid changeover between hole saw sizes and pilot drill bits without the usual fuss. It also makes removing material plugs significantly easier, helping to keep work moving on site. With 11 diameter sizes ranging from 20mm to 76mm, the set covers the full range of holes needed for pipe installation, electrical back boxes, and recessed lighting — all with a consistent 44mm cutting depth. Features and Benefits: • Bi-metal construction with 8% cobalt HSS for extended service life • Lasts up to 2x longer than standard HSS M3 hole saws • Enhanced tooth geometry for fast, smooth cutting performance • Q-Lock arbor for quick hole saw and pilot drill bit changes • Q-Lock system simplifies material plug removal • Suitable for steel cladding, drywall, and multi-material applications • 11 diameter sizes from 20mm to 76mm included in the set Specifications: Diameter range: 20, 22, 25, 32, 35, 40, 44, 51, 60, 64, 76mm Working length: 44mm Net weight: 1.273kg Number of pieces: 15