GEW 20 SA (EGW 20SA)SHAC GEW 20 SA Linear Guide Block (EGW 20SA) The SHAC GEW 20 SA linear guide block is the short body carriage for the GEW 20 series, matching the EGW 20SA pattern used by other brands. It runs on SHAC GEW 20 rails and is ideal for small CNC and automation axes where space is limited but accuracy is important. SHAC is made in China yet delivers machining quality and smoothness comparable to Taiwanese guides, clearly above typical Chinese products.