Product Description The LENOX Tools Bi-Metal Speed Slot Hole Saw Kit with T3 Technology (26 Piece) features hole saws with enhanced tooth geometry to cut 50% faster than previous LENOX hole saws. Twice as durable as our previous generation when cutting through metal, these bi-metal hole saws feature thicker walls to minimize tooth loss and improve durability. Staircase SPEED SLOTS have wide slots placed low on each hole saw and multiple leverage points to make it easy to work plugs out with a screwdriver. This design effectively removes sawdust and chips and helps prevent plugs from becoming stuck in each saw. This hole saw set is 10% taller than previous models, they deliver cleaner cuts through two-by lumber. From the Manufacturer The Lenox Tools 308042000G 26 Piece Big Daddy Speed Slot Bi-Metal Hole Saw Set features the new Speed Slot Hole Saws by Lenox. The new Speed Slot hole saw outperforms all competitors in wood cutting, plug removal, and metal cutting applications. The patent pending Speed Slot features a staircase design for easy plug removal. The slot is wider than most and is placed lower on the hole saw with multiple leverage points to easily eject the plug with a standard screwdriver. The hole saw is 10-percent taller than the previous model to deliver cleaner cuts through two-by lumber. The Speed Slot efficiently removes saw dust and chips while producing a fast cut and preventing the plug from getting stuck in the saw. The new hole saw also features up to twice the life of the previous model when cutting metal. An enhanced tooth geometry, a thin kerf design and an advanced coating contribute to the efficiency of the cutting process by removing material faster, therefore generating less heat while cutting. Kit contains 3/4", 7/8", 1", 1-1/8", 1-3/8", 1-1/2", 1-3/4", 2", 2-1/8", 2-1/4", 2-1/2", 2-11/16", 3", 3-1/4", 3-3/8", 3-5/8", 3-3/4", 4-1/8", 4-1/2", 4-3/4" hole saws; 2L 1/2", 5L 3/8", 1L 1/2" standard arbors, and three pilot drills.