This LENOX 12 Piece Electrician s Carbide Hole Cutter Kit has precision ground carbide teeth for fast cutting of clean, round holes. An over drill stopper helps prevent the tool from penetrating beyond the hole. The split point pilot bit starts on contact for faster penetration and less walking. The 12 piece LENOX hole saw kit contains 7/8 in, 1 1/8 inch and 1 3/8 inch attachments for versatility.