Bessey AV2 Adjustable Flooring Edge Spacing Tool, Red/Black Insert between the wall and the first row of flooring Adjustable to compensate for wall irregularities and remove is a quick turn of the dial to release pressure Wide contact and support area for avoiding pressure points on the floorboards durable, glass filled nylon construction adjustable dial setting for gaps of 3/16" - 13/16" 5mm -20mm 3 1/2" jaw face width