They don't always fit the standard 1/2 KO hole but are much cheaper to use than the metal parts. (They also fit the PVC clutch hub pretty snugly, in case anyone is interested.)
π 50 Pack of P MAP Maple Pocket Plugs
7 Review
π Enhance your Woodworking Projects with KREG P PIN Solid Wood Pocket Hole Plugs
8 Review
WIDGETCO White Hole Plugs
9 Review
High-Quality White Plastic Flush Type Plugs for Industrial Hardware Applications
Stainless Steel π© Fastener Hardware by BIGTEDDY
Stainless Fastener Bracket for Furniture Bedframes
π© N100 792 National Hardware Plated Holder
π© Enhanced Durability and Stability: Outside Joining Aluminum Profile Bracket