Dynabrade 51106 Collet, 5/16"-24 Female Thread, 1/4" Capacity, 4-Piece Collet 
Insize 3220-4, INSIDE MICROMETER, 3-4″, 6928640328572
$161.16
Graduation .001″
Ratchet stop.
Carbide measuring faces.
Optional accessary: setting ring (part no. 6313), micrometer stand and clamp (part no. 6301 and 6301-1).
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