fischer Expansion Plug S12 1/2" x 2-3/8" (12x60mm) 25pcs Rimless Nylon Expands in Two Directions, for Concrete and Solid Masonry, Ideal for Wall Mounting, Shelving, and Electrical Installations

Just google check the size you need to make sure you are getting exactly what you want. These are some of the better anchors I have used.

Good quality

These are apparently are for going into concrete. It didn't work in drywall until I cut off the open end about 5/8 of an inch; then they worked fine.

Wish these came with screws to fit. This is just to big for my plans. I must not understand what 12mm really means

worked great

Fischer anchors are built to provide strong and secure fastening. They grip the base material firmly and make sure that the fixtures or objects stay in place. What I really appreciate these anchors is their 2-way expansion design. They not only dig in deep but also spread out horizontally, making sure my fixtures stay exactly where I put them. They're made from tough nylon that can take a beating. The installation of Fischer anchors are pretty straightforward to set up. Keeping in mind, these anchors are like specialists in their field. They perform their best with solid material. So, if you're working with concrete or masonry, they're a fantastic choice.

It's hard to find plastic anchors this large at any hardware store. Sometimes it is nice to be able to use this kind of anchor in concrete instead of metal drop-in anchors or having to use epoxy etc. This is good for light/medium forces.These are made of nylon which is a particularly strong and durable type of plastic when used as an anchor.The drill depth for this one is at least 80mm.This is for screw diameter 8-10mm.

Even though the dimensions are mentioned, I didn't realize how big this would turn out to be. They are good quality though.