The Bosch PRO 14 Piece Multi Material PC Plus Hole Saw Set is a professional bi-metal hole saw kit designed to handle the range of materials encountered during interior installation work. Lasting up to 2x longer than a standard HSS M3 hole saw, it is an ideal choice for electricians and plumbers who need a single, reliable solution on site. The set features high-cobalt HSS alloy teeth — incorporating 8% cobalt — for extended cutting life and consistent performance across tough materials including steel cladding and drywall. The enhanced tooth geometry delivers fast, smooth cuts with reduced effort, making it well suited to repetitive tasks such as installing electrical back boxes, pipe runs, and recessed lighting. Compatibility with the Bosch Power Change Plus keyless arbor system means swapping hole saws and pilot drill bits is quick and straightforward, with material plug removal handled efficiently. This reduces downtime between cuts and keeps work moving on busy installations. Features and Benefits: • Bi-metal construction with 8% cobalt HSS for extended cutting life across multiple materials • Lasts up to 2x longer than a standard HSS M3 hole saw • Enhanced tooth design for fast, smooth cutting through steel cladding and drywall • Compatible with the Bosch Power Change Plus keyless arbor for quick, tool-free bit changes • Simplifies plug removal, reducing downtime between cuts • 11 diameter options from 19mm to 76mm to cover a wide range of installation tasks Specifications: Diameter (mm): 19, 22, 25, 29, 35, 38, 44, 51, 57, 64, 76 Working Length: 44mm Net Weight: 1,338g Number of Pieces: 14