XXL length with a fully reversible drive head. Universal spline drive works on 6 different fasteners: Spline, Torx, Square, 12 point, 6 point and a 50% rounded fastener. Patented 90 tooth ratchet cycles in 4 degrees . Flex head has a wide 180 degree flex range. Limited lifetime warranty This 4 piece set features added reach and delivers versatility, strength and accessibility. Set includes sizes: 5/16" x 3/8", 7/16" x 1/2", 9/16" x 5/8" and 11/16" x 3/4". The spline shape works on 5 fasteners (spline, 6 point, 12 point, female Torx, square), and even on 50% rounded fasteners. The patented and first to the market 90-tooth design delivers superior accessibility in tight spaces with a 4 swing arc. The XXL length allows improved access to common hard to reach automotive applications. The offset gear offers more surface contact and access to recessed fasteners. The durable switch button allows for quick-change ratcheting direction, and the flex head has a wide 180 degree flex range.