Brand: Design Engineering DEI Manufacturer's Part Number: 50216 Part Type: Knives Product Line: Boom Mat Blade Lock Knives Summit Racing Part Number: DEI-050216 UPC: 607078502162 Interchangeable Blades: No Knife Handle Material: Rubber Knife Handle Finish: Red Quantity: Sold individually. Boom Mat Blade Lock Knives Boom Mat blade lock knives are specially designed for the custom trimming of your Boom Mat thermal Acoustic Control products. They feature three cutting positions for precise cutting control and a built-in string-cutting notch. Boom Mat blade lock knives have a quick blade-release push button so that the blades can be quickly reversed or changed. A quick-change， sliding pull-out storage tray in the back of the knives holds spare or used blades. The cushioned， rubberized ergonomic handle gives you a better grip and makes using these knives safe and comfortable.