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Base (Int.): 5/16" Dia. x 3/8" Depth
Top Hole: Drilled 1/8" Dia.
Base Flat (Ext.): 13/16" Dia. Tapered to 5/8" Dia.
Base Overall: 5/8" High
For more information on the specifications of this item: Toll Free Phone Number: 1-877-773-7200 Toll Free Fax Number: 1-888-334-4146