Working size. Match profiles, sizes and dimensions to the workpiece.
Compatibility. Check drive, shank or attachment details when used with another tool.
Contents. Review set composition so that required sizes are actually included.
Comparing options
Match the working size and profile to the fastener or material. Check drive or attachment details where another tool is involved. Read the individual sizes in a set rather than assuming the largest pack covers every need.
Questions about Tool Clamps & Vices
Does a large set contain every size?+
No. Read the itemised size list.
Are metric and imperial sizes interchangeable?+
Use the size specified for the fastener rather than assuming a near match is suitable.