AP2 Axle Peg 5/16" dia. tenon x 1-9/16" tenon length. Wood axle peg for wheels with 3/8" hole. Axle peg tenon length is 1-9/16". Overall length approx. 1-13/16". The peg is snug in 5/16" hole. Typically you make the hole in toy body 5/16" and your wheel has 3/8" hole, allowing the axle to attach to toy and the wheel to spin freely.
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