The Klein Tools 39-Piece Complete KNECT™ Pass Through Impact Socket Set features a 90-tooth pass through ratchet and a Cushion-Grip™ pass through screwdriver for driving hex nuts on extended threaded rod. The 1/4-Inch square drive adapter allows for use with traditional sockets. Set includes 18 SAE and metric impact-rated sockets, 6 SAE and metric HD flip sockets, and (5) 1/4-Inch ProFlex impact driver bits.Features Backwards compatible with standard 1/4, 3/8 and 1/2-Inch drive sockets with the included KNECT™ adapters Socket sizes: 1/4, 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4-Inch and 8 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 17 mm, 18 mm; Bits: PH #1, #2 , T20, T25 TORX® , 5/16-Inch slotted 1/4-Inch magnetic socket doubles as a standard 1/4-Inch bit holder Cushion-Grip™ pass through screwdriver handle receives KNECT™ (M) sockets or adapters Pass through 90-tooth socket wrench for driving hex nuts on threaded rod and requires only 4 degrees of swing for ease of use in tight space with a 20-Percent improvement over 72-tooth ratchets Compact, modular storage system with a clear lid is compatible with MODbox™ and stackable with other cases of similar design Pass-Through Head for Driving Hex Nuts 1/4-Inch socket doubles as a standard 1/4-Inch bit holder Klein KNECT™ (M) specialized 1/4-Inch flip socket adapter compatible with Klein Tools Pass Through Socket Wrench and any 3/8-Inch square drive ratchet Warnings Do NOT use to pry or chisel. Always wear approved eye protection. NOT insulated. Will NOT protect against electrical shock. Drive Size: 1/2 in, 3/8 in, 1/4 in Socket Sizes: 1/4 in, 5/16 in, 3/8 in, 7/16 in, 1/2 in, 9/16 in, 5/8 in, 11/16 in, 3/4 in, 8 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 17 mm, 18 mm Pass-Through Ratchet Teeth: 90 tooth Swing Arc: 4 degrees Material: Chrome-Moly, Chrome-Vanadium Finish: Black Manganese Phosphate Number of Points: 6 Overall Length: 7.5 in (19.1 cm) Width: 7.936 in Height: 1.783 in Overall Width: 11.38 in (28.9 cm) Overall Height: 1.63 in (4.1 cm) Weight: 5.05 lbs Number of Pieces: 33 Type: Impact Sockets, Pass-Through Socket Wrench Standard: SAE, Metric Included(s): (18) Sockets, (6) Flip Sockets, (1) Ratcheting Wrench, (1) Extension, (5) Adapters, (1) Bit Holder, (1) Flip Socket Shaft, (1) Handle, (5) 1/4 in ProFlex Impact Driver Bits, MODbox Case DownloadsBrochure 1Spec Sheet