Adjustable Bite Blocks - LARGE Two-Tone 12/Pk. Universal Sensor Holders. Large is suited for most size 1 & 2 sensors in the vertical position, and size 0 sensors in either the horizontal or vertical position. Patent-pending ratcheting bite block changes on-the-fly to form a custom fit around any size sensor, in either the vertical or horizontal position. Autoclavable. 12 sensor holders/bite blocks