ITEM NAME:Stainless Steel Tyre Depth Gauge Tread Depth Gauge Keyring Tread Ruler 0-30mm img *{margin:0;padding:0;.1pc Tyre Ruler. Made of stainless steel, not easy to rust, not easy to bend. Material: Stainless Steel. The pocket size easy to carry. Polished, bright and clean without burr, anti-rust engraved line and will not rub off.