Dynabrade 78518 2" x 3/4", 1/4-20 Female Center Thread, 80 Grit, 8-Ply, Dynacut A/O Square Pad, 100/pack 
Insize 1146-20B, MINI DIGITAL HEIGHT GAGE, 0-0.8″/0-20mm, 6928640380723
$183.59
Resolution: .0005″/0.01mm.
Measure height difference of two surfaces(1146-20B suitable for surfaces with barrier, such as rivet).
Buttons: on/off, zero, inch/mm.
Automatic power off, move the digital unit to turn on power.
Battery CR2032, data output
Made of stainless steel.
Optional accessory: data output cable.
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