Callaham's fully threaded arms. These arms are designed for use with traditional Fender tremolos and blocks, that use 10-32 threads. This includes vintage Fender Stratocasters plus many others, such as American Standard. These arms are not what you want for use with Callaham's Enhanced Vintage blocks, which are what we sell on this site. For these blocks, and for products that use these blocks, you want Callaham's Virtual Pop-In arms. Specs Callaham's arms are made of stainless steel, so there's no plating to worry about, and the arm will never corrode. Also, if you bend the arm to suit your playing style, you don't have to worry about plating flaking off like you do with a plated arm. Made in USA Thread: 10-32 UNF Compatible with Fender USA blocks, or any block that uses a 10-32 thread Tip color: parchment (we stock Fender tips in other colors at extra cost) Note: While this arm will work with Callaham's Enhanced Vintage blocks, you would be better served to use one of Callaham's Virtual Pop-In arms. Lengths Callaham makes arms in three lengths, please see images for comparison.4-1/8" | 105mm (DG) - Based on the stubby arm on David Gilmour's famous black Strat5-1/4" | 133mm (64) - based on an original arm from a 1964 Strat6" | 152mm (FE) - based on Fender's current production