High-quality, low-profile Hobbico Retracts fit most popular .40-.60 Airplane designs. 
FEATURES
Low-profile design fits easily into thin airfoil wings
Uses 5/32" landing gear wire struts with flat spots already ground in to prevent rotation.
Long, independent up-and-down lock mechanisms for easy adjustments
Only two moving parts to reduce friction and wear Wheels and collars not included
INCLUDES
Two Black Rectractable Main Landing Gear Units w/Straight Struts 
SPECIFICATIONS
Overall Length (with gear strut down): 8-7/8"
Overall Length (with gear strut up): 8-3/8"
Weight: 120g (for set) 140g (with axles included)
Measurements of the base unit without strut wire -
Bottom of mounting plate: 1-3/4" x 1-34"
Base unit body: 1" x 5/8" (wing needs to be at least 1" thick).