Railer 10 Pack 8 Point Star Double Square Trailer Bit Set. Premium S2 Steel 2 Inch 8 Spline Double Square Bit Set With Quick Release Shank and a Storage Bitrail (R2D10B01) Specification: Materials: S2 Steel Finish: Manganese Phosphate Length: 2" Hex Shank: 1/4" Package Includes: 2 x Double Square #1 6 x Double Square #2 2 x Double Square #3 1 x Bit Holder Made in Taiwan