Blue Boar(R) Master Combo Kit-11 Sizes MEGA Tungsten Carbide 2-1/4&rdquo; Hole Saws. Cut 10x Faster, 3x Larger, 40x more holes using cordless drills. For plywood, MDF, Particle board, Hardie board 11 Carbide Hole Saws: 3/4", 7/8", 1", 1-1/8", 1-3/8", 1-1/2", 1-3/4", 2", 2-1/8", 2-1/4", 2-1/2" Tungsten carbide teeth hole saws; One 5/8"-18 arbor with 7/16" shank, 1/2"-20 adapter, hex wrench 3 pilot bits (HSS twist, Carbide Masonry, Tungsten Carbide Tipped for woods) 2-1/4" cutting depth best when USED with 18v Cordless Drill set on SCREW SETTING ****NOT for use with 1/2" stud drills such as Milwaukee Hole Hawg which will rip the teeth off ****