Pre-owned HP 10707A Beam Benders in excellent condition with minor aesthetics blemishes (see pics).  This auction is for 5 (five) units per purchase.  2 lots of 5 units each available - (10 units total).

From Grok

HP 10707A Beam Bender OverviewThe HP 10707A (also known as Keysight 10707A) is an optical component used in laser interferometer positioning systems. It is designed to bend an incoming laser beam at a 90-degree angle, making it suitable for redirecting beams in precision measurement setups, such as those involving servo-track writing, coordinate measuring machines, or precision X-Y stages. It is compatible with systems like the HP/Keysight 5517 series laser heads and other optics such as beam splitters (e.g., 10700A, 10701A) and interferometers (e.g., 10705A, 10706A/B).

Key features include:
  • Based on a 1-inch (25.4 mm) steel cube with a fully reflecting 45-degree mirror face-centered on two adjacent faces.
  • Includes a housing for standard mounting.
  • Often used with the 10710A adjustable mount, which provides ±8° yaw and tilt adjustments (mount weight: 88.2 g / 3.2 oz).
Specifications
Parameter
Details
Function
Bends incoming beam at 90° angle
Beam Diameter
Designed for ≤6 mm (aperture: 10.16 mm / 0.40 in diameter)
Weight
58 g (2.1 oz)
Dimensions (Cube)
25.4 mm × 25.4 mm × 25.4 mm (1.0 in × 1.0 in × 1.0 in)
Offset
0.8 mm (0.03 in)
Mounting Holes
- #6-32 UNC through clearance for #4 or 2.5 mm (2 places) - #4-40 (0.15 in deep, 2 sides) - 4 holes #8-32 UNC on all faces
Other Measurements
- Entrance/return: 53.3 mm (2.10 in) - Exit/return: 35.6 mm (1.40 in) - Various center lines and spacings: 19.6 mm (0.77 in), 12.7 mm (0.50 in), 19.1 mm (0.75 in), 21.6 mm (0.85 in), 50.8 mm (2.00 in)
Compatibility
Works with Keysight/HP laser heads (e.g., 5517A/B/C), receivers (e.g., 10780C/F), and adjustable mounts (e.g., 10710A)