ALC1074: Features and Benefits: -Use in either an electric or pneumatic drill. -Leaves a clean hole that requires very little grinding . -Self centering point minimizes walking, will not require a punch. -Solid one piece construction will not break or snap. -Made in the U.S.A..This set of 4 spot weld cutters operate up to 2000 RPM. nbsp; Leaves a clean hole that requires little grinding. It's self centering and doesn't require a punch. nbsp; These are a solid one piece constructed cutter and are made durable! The set includes the following sizes: 1/4 quot;, 5/16 quot;, 3/8 quot; and 1/2 quot;.-4 Piece Spotweld Cutter Set .-Sets Kits do not have warranty/ see individual pcs for details.