Plastic Knuckle

Plastic knuckles are inserted directly into the open end of two handrail components to create a corner that may not be exactly 90-degrees.

Brass knuckles - Wikipedia

Garosa Handheld Plastic Knuckles Fingers Grip Ring Monopod Tripod

PAINFUL IN PINK PLASTIC KNUCKLE DUSTERS – MISFITT XXL

ABS Plastic Knuckles Unbreakable Lexan Paperweight - Shiny Gold

Plastic Brass Knuckles - Cakra EDC Gadgets

Black Knuckle Stun Gun - Knuckle Duster Stun Gun - Black Stun Knuckles

Black Knuckle Stun Gun - Knuckle Duster Stun Guns - Shocking

ABS Plastic Knuckles Unbreakable Lexan Paperweight - Black, Slash2Gash

3D printing: Suspected plastic gun parts found in raid on Gold Coast property - ABC News

Carnage Knuckles - Plastic Knuckles - Black - SMALL - PFKBKS

Pink Plastic Paper Weight – Panther Wholesale

NoMetalKnucks - Plastic Knuckles