M52 Punch Lok Hose Fittings Lok Menders 5/8" I.D. Hose Barb USA 5 3/4" Long 147O. You get 4 each of these you see in the picture. I Measure 1/2" I.D. or with a digital caliper I get .49 I.D. and .664 O.D. Punch-Lok single and double groove hose fittings of all types are designed and engineered for use with Punch-Lok clamps to make connections which will withstand high pressure services. The shape of the grooves eliminates damage to the inner wall of the hose. The Punch-Lok clamp brings the hose wall into the grooves with even compression around the fittings. Part Name M52 Hose Size 5/8" Length 5 3/4" No. of Grooves 5 Maximum Pressure 250 PSI Check out my other stores on Ebay, one of the largest inventories of "Creatology" and "Celebrate It" products from Michaels Stores more 1950's "pinup/model" pictures and Negatives. Bonanza has both my ebay stores combined into my Bonanza Booth, "DiscountCrafts4U", except the items I have listed in the "other" category on ebay that are not listed on Bonanza. Remember you can make an offer on any of my items on Bonanza by adding the item to your cart and then open the cart and click on the "make an offer" link. Be sure to check out all the freebies I have listed here on Bonanza too. My other 2 stores are: http://stores.ebay.com/Stargate-Cool-Stuff?_rdc=1 http://stores.ebay.com/Debbie-Dabbles?_rdc=1 You will not find better deals for the price anywhere. I combine ship on both stores to save you money. I have great feedback - fast ship - lots of other great stuff to check out.