| Name | RRS BH-55 Screw |
| Type | Ball Head |
| Stiffness About Vertical Axis | 14221 +/- 84 Nm/rad |
| Stiffness About Radial Axis | 6438 +/- 48 Nm/rad |
| Retail Price | $445 |
| Weight | 1.92 lbs (0.872 kgs) |
| Manufacturer weight rating | 50 lbs (0.4kgs) |
| Maximum Height | 3.5 in (8.9 cm) |
| Base Diameter | 2.8 in (7.1 cm) |
| Ball Diameter | 55 mm |
| Tension Control | yes |
| Panning Lock | yes |
| Quick Release | Arca Clamp |
| Name | RRS BH-55 Lever |
| Type | Ball Head |
| Stiffness About Vertical Axis | 12636 +/- 91 Nm/rad |
| Stiffness About Radial Axis | 5909 +/- 27 Nm/rad |
| Retail Price | $489 |
| Weight | 1.96 lbs (0.89 kgs) |
| Manufacturer weight rating | 50 lbs (0.4kgs) |
| Maximum Height | 3.5 in (8.9 cm) |
| Base Diameter | 2.8 in (7.1 cm) |
| Ball Diameter | 55 mm |
| Tension Control | yes |
| Panning Lock | yes |
| Quick Release | Arca Clamp |