25mm refers to size of webbing material that fits through the buckle. You get 2 male and 2 female buckles making 2 complete sets. 2 Black Plastic Side Release Buckles for 25 mm Webbing.
eBay
2PCS Tactical Vest Quick Release Buckle Slider Molle Strip Module Strip Buckle Quick Disassembly Tactical Fixture Kit Hunting
Aliexpress UK
Hook and Loop strap strapping Cable Ties with buckle Band luggage Strap. We will endeavour to respond within 24 hours. 2 cm (W) x 15cm (L) - 10cm Loop + 5cm Hook Tip. 2 cm (W) x 20cm (L) - 13cm Loop + 7cm Hook Tip.
eBay
Function Magnetic Quick Release Buckle ,Outdoor Tactical Gear DIY Accessories ,Backpack Chest Strap buckle / Helmet Buckle
Aliexpress UK
Color: Black, Grey, Khaki, Green, Dark Blue. Durable Canvas material to make sure outdoor sports safety in climbing hunting. Suitable for: military, cycling, hunting, skiing, hiking, daily, etc. Strong and tough, tight, wear-resistant, quick-drying, quick release.
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Barbell And Dumbbell Buckle 2.5cm Austrian Pole Buckle Nut Barbell And Dumbbell Accessory Fixing Quick Release Buckle
Aliexpress UK
QUICK RELEASE BUCKLES. EXTRA HEAVY DUTY. A PAIR OF TOP QUALITY. 5/8" THICK. STRONG BLACK. Starting in this trade back in 1969. let us know and we will list it for you. Suppliers to the professionals.
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Quick Release Buckle 2Pcs Tactical Molle Accessories for Universal Hunting Airsoft Vest Adjustable Quick Removal Waist Belt
Aliexpress UK
The size is relative to the webbing or strap size to go through the lugs. A range of quick release side buckles, 10mm (0.394") to 50mm (1.969").
eBay
10 Pairs Bike Chain Quick Link Connector Lock Set MTB Road Bicycle Power Chain Quick Release Buckle for 6 7 8 9 10 11 12 Speed
Aliexpress UK
A centre support rib for crush resistance, a reduction in overall length of the buckle and a design which allows the beauty of your product to show through are just a few features of our plastic buckles.
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5Pairs Bike Chain Quick Link Connector Lock Set MTB Road Bicycle Power Chain Quick Release Buckle for 6 7 8 9 10 11 Speed
Aliexpress UK
Durable yet lightweight injection molded plastic. The sizes is for the webbing used. 40MM SIDE RELEASE BUCKLES.
eBay
6 Pairs Bike Chain Missing Link 6/7/8/9/10/11/12 Speed MTB Road Bicycle Chain Quick Link Connector Lock Quick Release Buckle
Aliexpress UK
Color :Black, coffee, navy blue, army green, light gray, brown, beige, dark gray.
eBay
1/2pcs Outdoor Vest Quick Release Buckle Outdoor Camping Equipment Accessories Quick Disassembly Multifunctional Tool
Aliexpress UK