a compact stubby spanner rack,  designed for tool box or wall mounted deployment , it has room for 4 10mm x 3mm magnets to keep it anchored in the tool box,  or 2 screw holes for wall mounted.  It will hold 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm. or imperial equivalents .