These were needed to replace the locking pin on my 1 1/4" bike rack. The 1/2" and 5/8" pins are too big. Thickness and length like specified. Durable needle. With a decent washer, the pin is long enough to fit the width of a 2" clutch and has enough room on the other side for a cotter pin. I only wish they came with large flat washers to prevent the pain from sliding through the hole in the hitch.