Pack of 10 Grainger 2A733 Brass Crimp Ferrules for 1/4 id Hose .625 inner diameter These are used with a hose crimper on 1/4 inch inner diameter air hose Small hole diameter is .450 inches Ferrule inner diameter is .625 inches. Check carefully, 2A733 ferrules are sometimes listed with the wrong ID. .625 is the actual measured ID.
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