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20mm x 10mm setup blocks when paired with the 2.9 droop gauge allow you to set droop on each suspension arm of your race car to within .5mm. simply remove the cars wheels and set the chassis on the ride height blocks. Then use the droop gauge to measure to a fixed point on the suspension that is the same for both sides of your car. Take the guesswork out of droop adjustments. Blocks come as a pair joined by a tab. Seperate to use.