Professional tool for commercial or occasional use Metric combination spanners Manufactured from chrome vanadium steel for strength and durability Metric spanners Combination design spanner Combination so open one end on one part of the spanner and a ring spanner on the other end The closed end has a 15 degree ring for access into more restricted areas as well as to take your knuckles away from the item to prevent injury Bi-hex 12 sided ring spanner for greater leverage and less chance of slipping when using SET INCLUDES THE FOLLOWING SIZES - 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm , 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm and 24mm Comes in a plastic tray for easy storage and transportation