Cov qauv muaj ntau qhov ntau thiab tsawg, thiab cov qauv yog: 21 * 41 / 41 * 41, 41 * 62, 41 * 82, thiab lwm yam. Lub tshuab tib lub tshuab tuaj yeem tsim ntau qhov sib txawv, tuaj yeem txais kev hloov kho tsis siv neeg tsim lossis cassette tsim lossis kho cov chais los ntawm shims.
Cov qauv siv tau dav siv, tsis yog tsuas yog siv dav hauv kev txhawb nqa hnub ci, tab sis kuj muaj kev txhawb nqa los tiv thaiv seismic, nrog rau nws lub zog siab thiab yooj yim installation, nws tau dav pom zoo thiab siv los ntawm kev tsim kho kev lag luam.