Imperial spanners use the AF (across flats) system, where the measurement is taken between two parallel sides of the fastener. An inch spanner will fit an inch fastener. Metric Spanners Metric spanners also use the AF (across flats) system, where the measurement is taken between two parallel sides of the fastener. However, they will use metric measurements, giving a measurement in millimetres (mm) rather than inches. Spanner set applications

This new range of ultra-thin open-ended spanners from Laser Tools offers ten beautifully balanced and finished spanners that are manufactured from strong chrome vanadium and are ideal when space is restricted and there is just not enough room to get a spanner over the fastener. This could be gland nuts on shafts and pipe fittings, or a very narrow hex on a stud or shaft designed to hold it still while another fastener is removed. The number of pieces within a spanner set will vary, and spanner sets can be found to include one or more types of spanner, such as ratchet spanners, ring spanners, open-ended spanners, or combination spanners. Our range includes leading brands such as Bahco, Facom, Gear Wrench, Gedore, Stahlwille, Stanley, Wera & RS PRO. You can find more information in our spanner sets guide. What measurements are used for spanner sets? Imperial Spanners Free XGT 40V Max Brushless Blower (Battery & charger not included) or XGT 40V Max Kettle (Battery & charger not included) So, which is the set that turned our heads? We got busy in the workshop with eight collections to find out. How we tested them Set 6996 includes all the above ten spanner sizes and additionally they are presented in a very practical machine-cut EVA foam tray that is designed to fit in a tool box or roll-cab drawer, keeping the tools safe and always ready to hand.Free XGT 40V Max Brushless 125mm (5') Angle Grinder - Slide Switch (Battery & charger not included)