Expert Quality, bi-metal with 8% COB alt added for extra strength. This hole saw features a 1/4" hex shank and a 10mm depth collar with an integrated sprung arbor for quick waste release. Manufactured from high quality steel to prolong the cutting edge. Suitable for use on sheet steel, stainless steel, and non-ferrous metals. Display packed. Dimensions: 10.00cm x 4.60cm x 4.60cm Weight: 0.03kg