The Blue Spot Tools 10 PCE Micro Combination Spanner Set (4-11mm) are manufactured from carbon steel, heat-treated and nickel-plated for increased durability. Ideal for tasks where a smaller spanner is suited. The sizes range from 4 to 11mm and the spanners themselves have a thinner profile and shorter length to enable you to reach small spaces. Manufactured from chrome vanadium steel, heat treated and nickel plated for increased durability. Thin profile. Includes spanner sizes: 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, 9mm, 10mm, and 11mm.