Usage: cutting machine reversing function Made of aluminum alloy, durable in use. Convenient center hole socket used for aligning the router so that it is centered in the bit hole. It is easy to operate, saves effort and labor, and is easy to handle and expand the use of the machine from cutting at the same time. Size: 120*120*8mm/4.72*4.72*0.31" Product Description Features: Material: Aluminum alloy. Dimensions: 120 x 120 x 8 mm. Use: Cutting machine reversing function. Easy to install. Compatible models: Makita RT0700C (screw hole spacing 56 x 45 x 54.3mm), Dongcheng, Albion, Ken, Boda, Worx (screw hole spacing 70 x 60 mm). Easy to use, save effort and labor, easy to handle and use at the same time.