Climb Right Aluminum Spurs with ‘L’ Pads, complete with Gaffs.‘L’ pads provide the most basic padding and are lightweight and affordable.Calf adjustment 15 3/4: to 18 3/4:. Machine grade aircraft quality aluminium heat treated to T6. Spike length is 1 5/8: and is 4340 steel that is quenched and tempered. Break strength 40,000lbs. Manufactured to ASTM F-887-97 standards.