bedCLAW Anti-Wobble Bed Rail Shims, Set of 6 Steel Spacers B07KBFFX4P Best of all it is

Best of all it is waterproof and heat resistant

Metric M8 hanger bolt

Top Width: 3-1/8"

Individually the items included here would cost over $60

for the included 3-inch long screws

bedCLAW Anti-Wobble Bed Rail Shims, Set of 6 Steel Spacers B07KBFFX4P Best of all it isbedCLAW Anti Wobble Steel Bed Rail Shims are designed for use with hook on bed rails and bed frames as spring like spacers. They are ideal for use with wooden beds because they allow you to "snug up" the frame and prevent wobbling, shaking, squeaks, and damage to hook connectors from excess movement. You place these between your bed and the bed rails, placing the hook connector through the slot in the shim, then simply connect your bed back together