Outside Diameter (mm): 121
Gage Diameter (mm): 104
Center Hole Form: THREADED
Length (mm): 78
8R-4265: 120.55mm Outer Diameter Pin Retainer Collet
http://txaparts.com/shop/8r4265-8r-4265-120-55mm-outer-diameter-pin-retainer-collet-6772
http://txaparts.com/web/image/product.template/6772/image_1920?unique=6e91650
Application: 988B, 988F, 988F II
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