1" Cable Glands Nylon Straight NPT 3 Each T B .625 To .750 Cable Size USA 169B. This 1" Gland requires a 1 1/4" hole for box. Nylon Cable Glands NPT Thread - NPT Thread Cable Glands are watertight and durable. Seal clamp system allows the cord connector to tighten in a circular sequence on the sealing ring to give outstanding strain relief without twisting or damaging the cable Simply push the cable through the liquid tight Nylon strain relief tighten locknut for quick installation Threads into your panel for clearance, locknut included Internal Ratchet with Self-Locking feature protects against vibrations Screw cable glands into NPT Thread (National Pipe Thread). Watertight. ‘Collet’ design of body accommodates various size cords, cables, tubing, etc.. Nylon NPT thread cable glands body material is resistant to most common chemicals solvents. For best results, use the minimum size that fits into your cable. No disassembly required. Made of UL approved NYLON 66, 94V-2 (Black). IP68 Rated Submersible Dustproof. UL Recognized. 94V-2 Flame Rating. 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 3 stores are: You will haft to copy paste into your browser links below 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.