Bi-Metal Hole Saw HSS Set In Plastic Cases Material : HSS With Varied Toothing Cutting Depth : Up to max 10.0 mm Jacket : Special Steel Type : Premium Description : 19-Piece Set of Bi-Metal Hole Saw 16. - 29. - 51. mm + 2 Arbor Holders A1 and A2 + 1 pilot Drill HSS 6.35 mm x 82.0 mm + Extension 300.0 mm, Arbors For A1 and A2