I have been using 1/2" EMT (Electric Metal Tubes) to attach kayaks to my trailer and these plugs fit perfectly, prevent ingress of Rainwater in pipes and protect kayaks from sharp edges. Will update my review if I see any issues.
π Marinco 6365CRN Locking Plug 250V: Secure and Reliable Power Connection Solution
9 Review
π Kreg P OAK Plugs Pocket Hole 50 Pack
7 Review
WIDGETCO White Hole Plugs
π 50 Pack of P MAP Maple Pocket Plugs
Stainless Steel π© Fastener Hardware by BIGTEDDY
Stainless Steel Bracket Shelves: Industrial Hanging Hardware
8 Review
π§ Boeray Stainless Steel Straight Brackets Mending: Durable and Versatile Support Solution
Stainless Fastener Bracket for Furniture Bedframes