For $12.50 I took a chance and bought two. The base is smaller than 1.5" but they still fit my ARCA rail. Took off 1 star because the bolts protruded out the side.
REKON Outdoor Gear™ Tripod Adapter Picatinny Rail to Arca-Swiss Mount (for REKON BH-1 Ball heads only, see SKU R023 for our BH-3HD and off brand compatible adaptor). Quickly attaches to our BH-1 ball-head while providing a direct attachment to Picatinny rails of Mil-STD-1913 or Stanag 4694 / 2324 configuration. Eliminate the added weight and bulk of a vise style weapon mounts with this adapter. Heavy duty and secure - requires 3 open slots on picatinny rail for attachment. ***Picatinny Rail & Ball-Head Not Included ***
**Picatinny Rail & Ball-Head Not Included**
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