TUSQ bridge pins come in two sizes or styles, Traditional Style, sized to fit Martin guitars, and Presentation Style, which fit most other guitars.   This guide is written for Presentation Style pins.    

Although Presentation Style pins are sized to fit most all guitars let me tell you how I check to see if the pins will work if I have any question here at the shop. The most important measurement when sizing bridge pins is the diameter of the top of the shank, immediately below the collar beneath the pin head. Measure using an accurate ruler or calipers, to within .03 inches or .8 mm. Note that the overall length of the pin is inconsequential, as the pin is suspended in the hole by the top of the shank. The shank for these pins measure .1920in/4.93mm.

Presentation Style pins are available in both classic black and classic white or with inlay of Mother of Pearl or Paua.