Cyclone HSS Premium Grade Annular Cutter, 13 16 in dia x 2 in Depth, 3 4 in Weldon Shank, Includes Pilot Pin no checkout water buffalo rawhide They're ideal for water buffalo rawhide They're ideal for use on broad faced striking surfaces in a broad range of applications soft and flexible nose pads hold securely without pinching Wider nose clip fits a variety of facial types Silicone mouthpiece is more comfortable to wear over long periods Packed in sealable plastic bag (carrying bag sold separately 79BAG) Evolution standard geometry is sufficient for most drilling applications Manufactured specifically to maximize hole accuracy while minimizing cutter vibration and extending annular cutter life Using this standard geometry enhances accuracy and saves time This allows for a single ejection of slugs when drilling through stacked material