Schaefer's Big Boat flat batten receptacles are engineered to handle the extreme compression loads experienced on today's high roached mainsails. Machined aluminum body and backing plate keeps weight to a minimum while retaining strength where needed. The 4500-12 accepts 12mm studs from Schaefer slides or competitors track systems. Leech loading and fully adjustable for easy batten fit. Fits battens up to 45 mm x 15 mm. Adjustment range 3.75" (95mm), Length 9.5" (241 mm), Width 3.5" (89mm). Weight 2.1 lbs, 1.0 kg.