The C-4 is a hand punch for installing turn button type fasteners into canvas and upholstery. It cuts an oval hole in the center and pierces four smaller holes surrounding the center hole (one at the top and one at the bottom and one on either side of the oval)

'-4':3 'bottom':43 'button':11 'c':2 'canva':15 'center':25,33 'cut':19 'either':47 'fasten':13 'four':28 'hand':6 'hole':22,30,34 'instal':9 'one':35,40,45 'oval':21,51 'pierc':27 'punch':7 'side':48 'smaller':29 'surround':31 'top':38 'turn':10 'type':12 'upholsteri':17

C-4

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