Genmitsu 4 Pack Hold Down Clamp Kit, CNC Router Clamp for Woodworking and Metalworking, 3-7/20''L x 4/5'' W x 2-7/10''H, Compatible with CNC Router Machine PROVerXL 4030 &3040 Extension Spoilboard - Amazon.com
Genmitsu 2PCS T-Track Mini Hold Down Clamp Kit, CNC Router Clamp for Woodworking and Metalworking, Compatible with 3018 CNC Router Machines - Umart.com.au
CNC Spoilboards / Wasteboard Cams and Clamps Digital SVG - Etsy