Expert Quality, bi - metal with 8% COB alt added for extra strength. 1/4" hex shank and 10mm depth collar with integrated sprung arbor for quick waste release. Manufactured from high quality steel helping to prolong the cutting edge. For use on sheet steel, stainless steel and non ferrous metals. Display packed. https://elecena.pl/product/27247880/draper-expert-34986-29mm-bi-metal-hole-saw-with-integrated-arbor 2024-11-12 https://elecena.pl/product/27247880/draper-expert-34986-29mm-bi-metal-hole-saw-with-integrated-arbor 2026-07-14