Series 19 I-Beam Car – Adjustable Track Stop – Spring Loaded – 25mm(1″). Track Fastenings: To suit 5mm(3/16″) countersunk fasteners at 100mm(3-15/16″) centres,Stop Holes: – 50mm (1-31/32″) centres,Track is supplied with RC7250-INS insulating inserts to eliminate corrosion between track and fasteners, Minimum Curve Radius, For 51mm(2″) car Min horizontal ‘A’ curve radius = 400mm (15-3/4″). Min horizontal ‘B’ curve radius = 400mm (15-3/4″),For 86mm (3-3/8″) car Min horizontal ‘A’ curve radius = 1200mm (47-1/4″). Min horizontal ‘B’ curve radius = not suitable,For 105mm (4-3/16″) car Min horizontal ‘A’ curve radius = 400mm (15-3/4″). Min horizontal ‘B’ curve radius = not suitable,Applications: Mainsheet and self-tacking jib travellers on dinghies and catamarans, Mainsheet systems on boats to 9M (28′) , Materials: Stainless body & plunger.