MIDGET BIRD CAGE SET (LEFT AND RIGHT BIRDCAGE). BILLET ALUMINUM (NOT CAST). COMPLETE WITH ANGULAR CONTACT BEARINGS, TORSION ARM BOLTS (WITH WASHERS), AND RADIUS ROD BOLTS. LIGHT WEIGHT AND SUPER STRONG. SET INCLUDES * RIGHT BIRD CAGE. * LEFT BIRD CAGE. * (2) BEARINGS. * (2) GRADE 8 TORSION ARMS BOLTS WITH WASHERS. * (2) GRADE 8 RADIUS ROD BOLTS. TECHNICAL SPECS WEIGHT: 3.875 LBS AXLE: 31 SPLINE MATERIAL: (BILLET) ALUMINUM FINISH: NONE RIGHT BIRDCAGE HAS CALIPER BRACKET FOR CALIPERS WITH A 5 1/4 BOLT PATTERN, SUCH AS WILWOOD DYNALITE & WILWOOD DYNAPRO 2.16" INSIDE DIAMETER ON THE BEARINGS, WHICH ACCEPT THE 31 SPLINE BEARING INSERTS THAT ARE NOT INCLUDED WITH THE BIRDCAGES FITS TRIPLE X MIDGETS, AS WELL AS SIMILAR POPULAR MIDGET CHASSIS