Many people attract birds with commercial suet cake. I make my own, see https://www.instructables.com/id/Feed-the-birds-with-DIY-cakes/, and made the feeders to hold the cakes. The material dimensions shown below are for my cakes. You may need to modify them for commercial cakes.

TOOLS
Drill & bits
Wire cutters
Stapler and staples
Tape Measure
Pencil & marker

MATERIALS
2-1" x 1" x 7"
2" x 9" x 1/4"
1/8" nylon cord..about 36" long
1/2" x 1/2" hardware cloth 7" x 14"

Step 1: Getting Started

Measure the hardware cloth and mark it with the marker. Cut the 7" x 14" piece. Freshly cut wire can be very sharp so be careful.

Measure and cut the sides and the top.

Measure 6" from one end of the piece of hardware cloth and mark it. Use one of the uprights as a support and line up the mark on the hardware cloth with the edge of the block. Bend the hardware cloth over the block to a right angle. Flip the block and hardware cloth over and make another right angle bend so you have a U shape.

Loosely assemble the two sides in the formed hardware cloth. Center the top over the uprights and mark the locations for the holes at the outside edges of the uprights. Drill holes just large enough for the cord.

Step 2: Assembly

Staple one end of the cord to the outside of one of the uprights. Feed the cord up through one hole in the top and down through the other hole. Staple the other end of the cord to the second upright.

Position the uprights in the formed hardware cloth and staple them into position.

That's it. You are ready to insert a bird cake into the feeder and hang it from a branch or nail. Position your new feeder well off the ground and away from shrubs etc. so predators can't get the birds you attract.

These feeders are easy and cheap so you can make several as gifts for friends. You may want to resize the feeders slightly to accommodate commercial cakes.