Bit Size: 5.25" New Smith TCI bits available in 5 1/4", 5 3/8", 5 1/2" and 5 5/8". 2 7/8" api regular pin. Large hole in center for maximum circulation. Also available with sealed bearings. $850 Bit Size 5.25"5.375"5.5"5.625" Bearing Type Not SealedSealed Bearing CAPTCHA Get new captcha! What code is in the image? Enter the characters shown in the image. This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.