This is the Great Planes XX-Large Stand-Off Brushless Motor Mount.

FEATURES:
Aluminum construction
Anodized black in color

INCLUDES:
Four 50mm (2") Aluminum Spacers
Four 20mm (25/32")Aluminum Spacers
Four 10mm (13/32") Aluminum Spacers
Four 5mm (3/16") Aluminum Spacers
Four 2.5mm (3/32") Aluminum Spacers
Eight 10mm (13/32") Mount Bases
Four 127mm (1/4-20x5") Socket Head Cap Screws
Four 102mm (1/4-20x4") Socket Head Cap Screws
Four 95mm (1/4-20x3") Socket Head Cap Screws
Four 51mm (1/4-20x2") Socket Head Cap Screws
Four 1/4-20 Blind Nuts
Four 6.4mm (1/4") Flat Washers
Four 6.4mm (1/4") Split Lock Washers
Instruction Sheet with two Mounting Templates on the back