1/4" x 1/2" BSF Setscrew Hex BS28:1906 in EN1A mild steel. Larger, thicker hex head than modern fasteners.Full bearing, single chamfer.TPI: 261/4" x 1/2" BSF Setscrew Hex BS28:1906£1.82PriceFinish*SelectDiameter*SelectLength*SelectGrade*SelectQuantity*Add to CartDeliveryDelivery costs are based on the weight of your order UK Delivery: 3 to 5 business days International: 5 to 7 business days