TECH Bias Uni-Seals provide a simple, safe, and permanent method to properly repair 1/2″, 13mm injuries in bias truck, agricultural, industrial, and small OTR tires. The oversized stem fills the injury while the fabric reinforced cap restores the integrity to the tire. Both the stem and cap permanently vulcanize to the tire with TECH’s thick chemical cushion gum. Best used with TECH’s Vulcanizing Fluid, Security Coat, and Bead Sealer.