Offset Canvas Clips For Picture Framing Starters Package. Includes (20) of each 1/8" 1/4" 3/8" 1/2" 3/4" 1". Included is 120 pieces #6 X 3/8" pan-head screws. - Amazon.com
Offset Clips - Z brackets - USA Art Supplies, Fine Art Materials & Picture Frames For The Visual Arts
Ook Canvas to Frame Clips | BLICK Art Materials
Ook Canvas to Frame Clips, Package of 100 - Walmart.com