Heller allmat sds plus universal drill bits heller 21683 8 this allmat universal drill bit from heller is suitable for use with a wide range of materials including masonry tile glass marble plastics metals laminated chipboard and breeze block this 10 x 200 x 260mm bit has a diamond ground carbide cutting edge and sds plus shank heller 21683 8 3718 allmat sds plus universal drill bit 10 x 200 x 260mm