Cyclone HSS Premium Grade Annular Cutter, 5 8 in dia x 2 in Depth, 3 4 in Weldon Shank, Includes Pilot Pin no checkout Mouthbit respirators offer a quick Mouthbit respirators offer a quick and economical method to escape non IDLH emergency situations Large Teeth are automatically disengaged during adjustment Air cushioned cloth sweatband is washable and durable 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