The “SR-88A” is engineered specifically for coupler latches on a variety of trailers and RVs. Hidden-shackle “u-shape” extremely reduces the chance of bolt cutting. For 2” and 2-5/16” couplers. Measure your coupler in advance to ensure the lock is the right fit. For shorter latch pins, or pins with limited space, see PACLOCK’s “79-Series” universal coupler lock. Engineered with a two 304 stainless steel anti-saw pins to prevent sawing and grinding. PAC-BAND keeps dirt and grime out of your cylinder, while the PAC-TETHER ensures you'll never lose your lock! Existing SR Customers Only: Choose Standard Rekeyable only if your key number is #26537–26547 or #93001–95802. All other customers should select UCS, PACLOCK’s higher-performance cylinder technology. Every Lock, One Key: One key for your security solutions – trailer doors, hitch pins, Pelican cases, or cam locks! The pick/bump resistant 6-pin Standard Rekeyable cylinder allows 2,800+ key codes. PACLOCK’s “SR-88A” features Standard Rekeyable cylinder technology, allowing it to be rekeyed but it is not compatible with UCS products. Compatible with key ranges #26537-26547 & #93001-95802. American Manufacturer: Made in USA with global components by a family manufacturer hiring veterans and people with disabilities. Our product line is growing, so if you don’t see your lock, call us! PACLOCK's “SR-88A” is engineered specifically for trailer coupler latches found on campers, flatbed trailers, utility trailers, landscape trailers, enclosed trailers, and cargo trailers. The “SR-88A” was developed in response to your request to be able to key all the locks on your trailer together. There is no other coupler lock on the market that allows you to key the coupler lock into other locks on your trailer. The “U-Shaped” design of the “SR-88A” prevents any type of bolt cutter attack. The “SR-88A” is machined in the U.S. from 6061 aluminum billet and then precision machined in PACLOCK’s manufacturing facility. Machining the body versus casting the body is critical because casted bodies can be easily defeated by melting the bodies with an off-the-shelf plumber’s torch. A body that was CNC machined from solid aluminum can hold up to the torch test. Don’t buy die-cast padlocks ever! 6-Pin technology (more than the industry standard 4 pins) provides over 2,800 unique key codes and makes duplicate key combinations extremely rare. Your key number is virtually unique to you. PAC-BAND keeps dirt, grime, and other elements out of your cylinder, extending the lifespan of your lock, while the PAC-TETHER ensures that you'll never lose your lock! CNC machined for U.S. precision and reliability, the lock body exceeds +/-0.003” tolerances for repeatable quality.