Spine Hinge Creaser for CreaseStream Mini, Stahl 25mm, and GUK 25mm Contents of Package Include: 4 x RIB012-B � Blue split creasing ribs used to crease 150-170gsm 4 x RIB013-Y � Yellow split creasing ribs used to crease 160-270gsm 4 x RIB019-BK � Black nylon split creasing ribs used to crease 270-350gsm How to Create Perfect Bound Book Covers on Your Folding Machine The Spine & Hinge Creaser produces up to 4 simultaneous creases required for perfect bound book covers, and does it at folding machine speeds. Or handle any jobs requiring multiple scores in close proximity. Your customer will judge a book by it�s cover�make it perfect with the right crease! Eliminates fiber cracking regardless of grain direction Adjustable spine and hinge widths (5/32� min) Crease from same side or opposite sides of sheet in one pass Use for other creasing operations as well