Mason 300 - SEATYLOCK

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Mason 300

The Widest of its kind! PATENTED pentagonal hardened steel crossbar profile - Stronger than any rounded crossbars, Double deadbolt locking mechanism for protection against twist attacks. *Mounting Bracket sold separately  

    Customer Reviews

    Based on 12 reviews
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    B
    Betsy Lane
    Mounting Bracket

    The mounting bracket worked great!

    M
    Mark Gonzalez
    Mason 300

    Best lock I ever owned and seatylock company you can trust made my bikes wish come true

    K
    Kobi
    Best fitment and services

    The mount sits perfectly in my Inokim OX, worth any penny.
    The delivery was fast

    M
    Masoud Saeedikhou
    Better than expected

    Where I am theft is a rare assurance, but it better safe than sorry.

    J
    J•SERRANO
    GRATEFULLY🔒SECURED

    I'm very grateful to have received the mounting bracket with the zip-ties. Delivery was quick. Although the bracket arrived with a minor scratch on one side of the base, it can't be seen --especially with the lock in it. It's a quality made product. So far my Seatylock U Lock feels secure without rattling much when riding my e-scooter. Thank you!

    V
    Veronica Dye
    Great lock, easy ordering

    The lock is huge and I can lock my bike up anywhere! It's big and a little bulky, but I live in NYC and needed a big lock to feel safe locking my bike up outside. Delivery was great and easy.

    J
    Jb
    Great lock

    Very sturdy solid lock. Weights almost half of all similar size locks. Had my doubts at first as the lock rattled alot while cycling. So I added two 14mm rubber o-rings on each shackle. Fits perfectly now & no rattles while biking.

    J
    Jack Peterson
    Sorry, but I like and don't like this mounting bracket

    What I like about this mounting bracket is that the U-lock stores quickly and easily, although I did augment the bracket with a Velcro strap on to hold the lock to the frame on the other end.

    I like the Pentagon 300 u-lock that I bought (so far). What I don't like about its mounting bracket is that it uses a strap, which stretches over time and if you cut the strap after installation it is very hard to try and get it tight on the bike frame again. Why Seatylock would use this flawed bracket mounting design is a mystery to me because a conventional bolt-on bracket would be much better (that's what my other u-lock brand uses and it's never come loose.)

    J
    Julie Lycklama
    Great customer service

    Great product & great customer service! My bracket came with a missing piece and they sent me a new one a couple of days later, with no hassle.

    L
    Leslie Thomas
    Strong sense of security

    See attached image. I love this lock. It gives me a strong sense of security. Thanks.

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