What is the maximum open jaw size of the 99-080 Bostitch Ratcheting Adjustable Wrench? Support October 03, 2020 18:20 The maximum open jaw size is 1-3/16" Related articles Who can I contact for Stanley Bostitch Office Supplies (i.e. staplers, hole punches, pencil sharpeners, etc) customer service? What is included in the Bostitch® ORK6 O-Ring maintenance kit for MIIIFS/MIIIFN? Comments 0 comments Please sign in to leave a comment.