Bimetal hole saw 4 sizes and 3 step drills. Excellent cut! Hexagonal shaft titanium spiral specifications; Comes with an aluminum case that is convenient for carrying; Set contents: Bimetal hole saw, BL-21 (diameter 0.8 inch (21 mm) x 2, BL-27 (diameter 1.1 inch (27 mm) x 2, BL-33 (diameter 1.3 inches (33 mm) x 1, step drill) 4-22mm 1 x 1 piece; 0.2 - 1.3 inches (6 - 33 mm); Aluminum case; Size: W 12.2 x H 7.9 x D 2.9 inches (310 x 200 x 73 mm); Weight: 3.7 lbs (1.7 kg).