If you are looking for a micrometer that will measure the internal groove of a part
Output Drive Size 3/4 in
42 secondary action grinding teeth
9 lb Breakaway Torque 1
5 hr Light Output Modes High / Medium / Low Peak Beam Intensity 900/100 cd Lamp Life 100
Proto JTS-0141RRBX1A Master Tool Set 141 Total Pcs, SAE, 1/4 in/3/8 in/1/2 in Socket Drive Size, Tool Box E392SDK If you are looking forMaster Tool Set, Tool Storage Type Tool Box, Measurement Type SAE, Drive Size 1 4 in; 3 8 in; 1 2 in, Number of Pieces 141, Pliers Included (1) Diagonal Cutting Pliers, Lineman's Pliers, (1) Locking Pliers, (2) Long Nose Pliers, (2) Specialty Pliers, Screwdrivers, Keys, and Bits Included (1) Screw Starter, (13) Hex Keys, (2) Phillips Screwdrivers, (5) Slotted Screwdrivers, Sockets, Drive Tools, and Accessories Included (11) Accessories, (4) Drive