The 1500-BR is designed for bolt rope luffs. Fits flat battens up to 15mm wide and 8mm thick or round battens up to 10mm in diameter. Adjustment range of 1-3/16" (30mm). Overall size 4-1/16" x 2-5/16" (103 x 59mm) Includes backing plate. Injection molded high strength uv treated plastic.