Letterlok 4000 This unique machine produces a virtually leak proof UL approved fastener from two pieces of metal at speeds of up to 40 hits per minute.  Designed specifically for the sign manufacturing industry to fasten letter backs to letter returns, it features a deep throat, large opening, and adjustable table ... Eliminates staples, holes, rivets, and welds Fastens letters up to 5' in height and 8.5" deep Uses standard shop air (100 psi) Optional laser pointer to locate joint               Letter Lok 3000   Fastens open ends of channel letters Eliminates staples, holes, rivets, & welds Maximum capacity 2 ply .063 aluminum Comes complete w/ mounting bracket, pivot arm, and spring balancer for mounting to LetterLok 2000 or 4000

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