IVY Classic 27064 4-Inch Bi-Metal Variable Pitch Hole Saw， One Piece Arbor Attached， 1/Card<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Cuts stainless and mild steel， non-ferrous metal， plastic and wood， 1-1/2-inch cutting depth</li><li>Bi-Metal construction with M-3 cutting edge， Cobalt Advantedge (Registered Trademark)</li><li>Variable pitch， positive rake tooth design 4-6 TPI minimizes tooth wear</li><li>Solid alloy-steel back reduces vibration and convenient， one-piece hole saws save arbor changes.</li><li>Use with 1/4 x 4-5/16-inch pilot bit: IVY Classic 28114， 28115 or 28136</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41OABkVD2qL.jpg" noproxy>