These slimline double ring spanners with 75° offset heads are manufactured to DIN 838 and ISO 3318. They come as an 8-piece set containing sizes 6 x 7, 8 x 9, 10 x 11, 12 x 13, 14 x 15, 16 x 17, 18 x 19 and 20 x 22mm. Each spanner has a clearly marked place for storage within the plastic holder that also offers holes to allow it to be fixed to a wall.