CAN NOT USE OSBORNE NO.445-3 TOOL TIGHT THE CLIP, We are offer upholstery materials to NY, NJ and PA working room. 8/9 Gauge for Seat, 11 Gauge for Back on our other listing B09GH6NJKJ. Our zig zag spring spacing 1" apart. Most modern version zig zag spring spacing less than 2", CAN NOT USE C.S. Osborne & Co. Brand No. 445-3, please use other smaller pliers.