Drop-forged Chrome Vanadium steel spanners. Hardened and tempered with a black electrodeposition finish for corrosion resistance. 15� Offset open-end and WallDrive(r) ring combination with long slim shafts. Supplied in an EVA storage tray. Tray Size (W x D x H): 285 x 400 x 35mm. PREMIER BLACK - One of a range of Sealey Premier Black Hand Tools, selected for supreme quality, suitable for daily professional use. BLACK ELECTRODEPOSITION FINISH - Hardened and Tempered for added corrosion resistance. OPEN-END WALLDRIVE(r) RING - 15� Offset keeps knuckles clear of obstructions. CHROME VANADIUM STEEL - Drop forged for increased durability and strength. LONG SLIM STYLE SHAFT - For comfortable grip. 25PC SET - Sizes include: 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,.