Halfords Advanced 100 is 20 to 100 Nm. For the build I bought a Sealey 20 to 140 Nm, also ½". For trackdays I found it convenient to buy an additional socket for the wheel nuts which lives on it all the time. You'll find there will normally be plenty of folks around you with a boot full of tools and other bits n bobs, and offer help and assistance, whether you want it or not.... :-) Jonathan PS: There are two traditional pieces of advice: take the load off the spring when it's not being used and have the wrench calibrated annually. In order: most of us probably do but have no idea if it's really needed, and "I'm sure that can wait till next year".