4 Jaw Geared Scroll Chuck Set 1″ x 8 TPI Thread with an 3/4 x 16 TPI Adaptor Included Including: 1 pc 4 Jaw Geared Scroll Chuck 1 pc Wood Screw Chuck 1 pc T Handle Allen Wrench 1 pc Cross Handle Lock Wrench 1 pc Allen Key 1 pc Flat Jaws 16 pcs Rubber Pins 1 pc Step Jaws 1 pc Pin Jaws 1 pc Wide Jaws 1 pc Indexing Plate 1″ x 8 TPI Thread plus a 3/4 x 16 TPI adaptor SPECIFICATIONS Chuck Diameter 3.75”/95mm Standard Dovetail Jaws Compression Grip 60-40mm | Expansion Grip 55-75mm Large Dovetail Jaws Compression Grip 100-80mm | Expansion Grip 95-115mm Stepped Jaws Compression Grip 25-5mm | Expansion Grip 15-70mm Pin Jaws Compression Grip 30-10mm | Expansion Grip 30-50mm Button Jaws Compression Grip 115-60mm.