Forged and heat treated 40Cr Alloy Steel for maximum durability. Extra thick Picket Driver head 30mm Hex-fitting. Turns your Jack Hammer from a concrete crusher to a power Picket / Post Driver. Drives fence pickets just utilize the impact of your Jack Hammer. Compatible with Hitachi, PH65, PH65SA, Augerton, Michigan, Ozito, TWM, Millers Falls PT4370, Z1G-DW-45, Makita and Baumr-AG electric bushing hammer (standard 30 mm / 1.1/8 inch hex). 121143: Specifications: Item Type: Jack Hammer Star Picket Post Driver Material: Alloy Steel Size: 32 x 50 x 220mm Suitable Type: 65A 121144: Specifications: Item Type: Jack Hammer Star Picket Post Driver Material: Alloy Steel Size: 50 x 70 x 220mm Suitable Type: 65A Easy to use and disassemble A must for driving star pickets for garden edges, farm fences, concreting pitching, mining, stepping.