Thin, but extra strong design, to reach confined working areas where traditional wrenches cannot reach. Drop forged, heat treated, chrome plated steel. Sizes: 8 x 9mm, 10 x 11mm, 12 x 13mm, 14 x 15mm, 16x17mm, 18 x 19mm, 20 x 21mm, 24 x 27mm, 30 x 32mm. Includes roll-up storage pouch.