The Klutch Flex Ratchet Wrench Set uses a flex-head design that allows user to reach confined areas. 72 fine tooth ratchet design provides fast performance. Less than 5 sweep for use in tight spots. Set includes metric sizes from 8mm to 19mm. Made of chrome vanadium steel. Backed by a lifetime guarantee. Flex Head Yes, Finish Type Full polish, Storage Type Rack, Ratcheting Yes, Pieces qty. 12, Measurement Type Metric, Metric Sizes mm 8-19, Material Type Chrome vanadium. Flex head allows user to reach tight areas 72 fine tooth ratchet design for fast action Less than 5 sweep for use in tight spots Chrome vanadium steel.