The LH-E1 Lens Holder from Canon is designed to hold the RF 24-105mm f/2.8 L IS USM Z lens when utilizing it in a rig system and has a 1/4"-20 female thread at its base.
★★★★★ Perfect support for my RF 24-105mm f/2.8 L IS USM Z in a rig. The 1/4"-20 base mounts securely and keeps everything stable. Solid Canon build—exactly what I needed.