National Hardware N182-667 4003 Couplers - Course Thread in Zinc, 1/4"-20 Use on vertical, horizontal, left or right hand applications Designed for axels on wagons, carts, etc. and other do-it yourself projects LifeSpan Limited Lifetime Warranty In vertical use notch in case holds bold in a locked position Use on vertical, horizontal, left or right hand applications Bolt diameter is . 32 LifeSpan Limited Lifetime Warranty In vertical use notch in case holds bold in a locked position