Klein's Bi-Metal Hole Saws pilot bit is optimized for fast, consistent cutting of steel. The blades provide the fastest, most consistent and longest lasting cutting on the market today. Heavy-duty construction includes thicker 5 mil back plates to stand up to abuse much better.Warnings Never use on or near live electrical circuits. Always wear approved eye protection. Read and follow safety instructions in power tool owners manual. Features Optimized teeth pattern for fast, consistent cutting of steel Optimized teeth pattern, Tri-lobe Shank, 118° Split-point Design Tri-lobe shank prevents slipping Tempered high-speed steel For use with Klein arbor (Cat. No. 31905) 118-degree split-point design Size: 1/4 in x 3-1/2 in (0.6 x 8.9 cm) Depth: 5.625 in Width: 1.728 in Height: 0.18 in Weight: 0.02 lbs Application: For Use with Klein arbors (31905, 31906) Material: Tempered high-speed steel Tip Angle: 118 degrees Shank Type: Tri-lobe Country of Origin: China Type: Replacement Bit DownloadsVideo DownloadSpec Sheet