This is the Servo Case Set for the Hitec HS-56HB Servo HRCM1351.

FEATURES: Black plastic construction Three part case design

INCLUDES: Top, mid, and bottom case parts Four long case assembly screw.

REQUIRES: HS-56B servo

SPECS: Length: 1-1/4" (32mm) Width: 3/8" (9mm) Height: 1" (25mm)  

BOX DIMENSIONS: 2.25" W. X .63" H. X 3.00" L. BOX WEIGHT: .01 LBS.