Another 15++ Strap Locks For Acoustic Guitar. If you use a strap at all with your acoustic guitar this item is for you!!! 5 fender straplock w/ button. 1,418 guitar strap lock products are offered for sale by suppliers on alibaba.com, of which stringed instruments parts & accessories accounts for 34%, bag parts & accessories accounts for 2. This video gives you all the information you need to put strap locks on.