The MACH-1 Racing Circle Droop Gauge is lite weight and made from strong and durable 7075 aluminium, it includes two 10mm droop blocks with magnets for easy storage.
 
To use - remove the 10mm blocks from the gauge and place under your chassis.
 
When finished, replace the blocks on the side of the gauge (logo up) and the built in magnets will hold the blocks in place.