Check the listing for details. MICROJIG GRR-RIPPER GB-1 Grr-Rip Smart Hook Push-Block, 2-Pack, Yellow. Condition: New. Listed at 64.81 USD. Grr-Rip Smart Hook Push-Block The Smart Choice For Safety Harness the ultimate gripping power of the only pushblock with Smart Hooks that know where to grab your work-piece. GRR-RIP Blocks's drop- down heel kooks are there when you need them and instantly retract when you don't. Safety's never been so smart GRR-RIP BLOCK's ergonomic handle is angled for comfort and precise directional pressure, ensuring a stable feed GRR-RIP BLOCK''s revolutionary Smart Hooks works with you, hooking the tail-end of the board to give you complete control and confidence. When you don't need them the heel hooks automatically retract or let you lock them in place Extreme Grip Podular Green GRR-RIP non-slip material gives you command over your work. Grr-Rip Smart Hook Push-BlockGrr-Rip Smart Hook Push-Block The Smart Choice For Safety Harness the ultimate gripping power of the only pushblock with Smart Hooks that know where to grab your work-piece. GRR-RIP Blocks's drop- down heel kooks are there when you need them and instantly retract when you don't. Safety's never been so smart GRR-RIP BLOCK's ergonomic handle is angled for comfort and precise directional pressure, ensuring a stable feed GRR-RIP BLOCK''s revolutionary Smart Hooks works with you, hooking the tail-end of the board to give you complete control and confidence. When you don't need them the heel hooks automatically retract or let you lock them in place