Designed as a Type 29 depressed-center disc, JET Tool's 41/2in. x 7/8in. Z80 POWERBLENDIII T29 Zirconia Flap Disc is built for safety and durability at high RPMs (up to 13300RPM). Whether used in fabrication shops or maintenance operations, it offers consistent performance on structural steel, weld blending, and surface prep. Its robust construction helps reduce downtime from frequent disc changes, making it a smart choice for metal pros balancing productivity and quality