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) MCW 8/30/04 ir/jxs