| Product Type: | Die Head |
|---|---|
| Connection Size: | 1" NPT |
Hi Larry, thanks for writing in. One of the differences is the shape of the underside of the die head. The 12-R has a round shape with spines. These match with the pawl of the ratcheting handle. The 11-R on the other hand has a hex-shaped underside. Aside from that, the 12-R is bigger, having a 3.63" OD while the 11-R is only 2.50".