This is the Robart #611 3/16" Wire Tri-Gear Set.
Consists of 608HD 90 Deg. Mains & 610 Nose Gear.

FEATURES: Part # 610 90 Deg. Nose with 5/32" Wire Strut
Light durable and compact perfect for up to a 10 pound aircraft
Durable, glass-filled, nylon housing supports an aluminum pivot
bearing which secures the tempered steel 5/32 inch wire strut
Positive up-and-down lock and positive tiller arm steering and smooth
cam action. A 1/8 inch dia. pushrod is tapped 2-56 on one end for
quick servo connection
Also operates with standard or retract servos.

Part # 608HD
90 Deg. with 3/16" dia. Wire Strut
Constructed from a durable filled nylon chassis, supporting a large
aluminum pivot bearing
Supplied with 3/16 dia. strut wires, each unit has positive up and
down locks and are designed for aircraft weighing from 5 to 10 lbs
These gears are also designed to operate with standard or retract servos.

INCLUDES: 2 - #608hd Main gear retracts
1 - #610 Nose gear retract
12 - Mounting screws
Instructions for Nose gear and Main retracts
Spare parts list

REQUIRES: Possible modification to aircraft to fit retracts
Possible modification to wire for wheels

SPECS: Nose gear: Total length closed: 8-1/8" (206.50mm)
open: 8" (203.20mm)
Base: Width: side to side w/mounting tabs: 1-3/4" (45mm)
w/o mounting tabs: 15/16" (23.5mm)
front to back w/actuating arm: 2-11/32" (71mm)
w/o actuating arm: 1-7/8" (48mm)
actuating arm extends: 1-1/8" (29mm)

Main Gear: Total Length closed: 11-1/4" (286mm)
open: 11-1/8" (283mm)
Base: Width: side to side w/mounting tabs: 1-3/4" (45mm)
w/o mounting tabs: 15/16" (23.5mm)
front to back w/actuating arm: 2-1/4" (57mm)
w/o actuating arm: 1-3/4" (45mm
accuating arm extends: 1-1/8" (29mm)