Gold plated stopper beads are made of base metal and have a silicone core. You can insert two strands of 2 mm round leather into them and they will hold the leather and make the necklace or bracelet adjustable. You can slide them if you want to adjust things but they will hold everything on place when you finish sliding the bead. It is recommended that you cut the end of the leather into a small point before trying to insert it into the beads. Once both strands have been inserted you can trim the end of the cord and put an endcap on it if you like
Gold 6 mm Premium End Caps
CZ Micro Pave Slider Beads, 5 Pcs Dainty Chain Silicone Stopper, 9 mm – A Girls Gems
10Pcs Stopper Beads Brass Rubber Beads Slider Beads Stopper Beads Insert Rubber Stopper Beads 2 Hole Adjustable Slider Clasps Round Beads with Column End Caps for DIY Leather Cord Bracelet, 3mm
50pcs Stainless Steel Gold Color Spacer Beads Big Hole Stopper Spacer Beads for Bracelets DIY Jewelry Making Components Findings - AliExpress
100PCS/LOT 4.5mm/6mm/7mm/8mm White Rubber Stopper Rings Charms Fit Leather Rope Non-Slip Jewelry Making DIY Positioning Beads
2 - 2.5mm Small Bead Stopper - ANT BRASS - 10 pcs-BB-SBS-2AB
10pcs Brass Beads with Rubber Inside Slider Beads Stopper Beads Long-Lasting Plated Round Real 18K Gold Plated 6x4.5mm Hole: 2mm - AliExpress
Findings & Essentials - Clasps, Toggles, & Eyes - Silicone Slide Clasp Beads - Bead World
Adjustable locking bead, small, sterling silver, 3mm, 2pcs.
10 STOPPER Beads 6.5mm 1.3mm Silicone Rubber Hole 6.5x3.5mm Antiqued Bronze Plate Round Slider Adjustable Bead DIY Bracelets 7225
Goldfilled Beads – Rosebeading Official
Quick Tip: How to Make a Stopper Bead on Leather Cord
Gold Filled Silicone Stopper Round Bead 4mm With Ring