Set No. 230: These Vee Blocks are supplied in matched and numbered pairs whti one steel slamp and steel screw-General Workshop Grade. Size of block:40 x 50 x 40mm / 1.575 c 1.969 x 1.575". Set No. 231:These Precision Vee Blocks are manufactured to BS3731 (Grade B) in case hardened steel. Supplied with a pair of malleable iron clamps with steel screws. Size of block: 32 x 42 x 32mm/1.260 x 1.654 x 1.260".