DA: 

Five hole prism shaped measuring section. Measures total and static pressure, yaw angle and pitch angle.  Furnished with individual calibration curves up to pitch angles of 40°.  Tip extends 2 diameters beyond holes.  Typical calibration shown in Fig. 4.  Smallest size can be inserted through 1/8" hole.  Usable up to Mach 0.7.

Standard diameters are 1/8", 3/16", 1/4", 3/8", 1.00"

DC: 

Five hole conical shaped measuring section.  Measures total and static pressure, yaw angle, and pitch angle.  More suitable for use near boundaries than type DA.  Furnished with individual calibration curves up to pitch angles of 40°.  Usable up to Mach 0.7.  DC-120 head fits through a clearance hole .62" diameter.

Typical calibration curve illustrated in Fig. 4.

Standard diameters are: 3/32", 1/8",
3/16", 1/4"

DAT:

Five holes plus thermocouple. Measures total and static pressure, yaw angle, pitch angle and total temperature. Furnished with individual calibration curves up to pitch angles of 40°.  Tip extends 3.5 diameters beyond holes.

Standard diameters are: 3/16", 1/4", 3/8", 1.00"