The 1/2" square drive configuration offers broad compatibility with standard hand tools
For added convenience
With a working range of up to 15 metres and an accuracy of ±3mm at 10 metres
and collectors of genuine Britool tools
please use non-ratcheting ring end of to unfasten and ratchet ring end to re-tighten
Sealey Imperial Nut & Bolt Checker Impact Sockets & Accessories The 1/2" square drive configurationAccommodates 22 Imperial sizes for common nuts, bolts and screws. Designed to accurately identify and measure threads, ensuring correct fastener selection. Manufactured from durable alloy for reliable, long term use. Compact and lightweight for easy transport and storage. Features easy to read markings with male and female versions of each size clearly labelled. Imperial Sizes: Fine; 10 32, 1 4" 28, 5 16 24, 3 8 24, 7 16 20, 1 2 20, 9 16 18, 5 8 18, 3