Grand Secret SRL IM ni mtoa ya bidhaa na huduma kama vile dirisha mishipi, mbao,dirisha sills na jambs, mbao,weatherstrips, mbao, kwa milango na madirisha,dirisha muafaka, chuma, kwa ajili ya ukaushaji mara mbili,dirisha muafaka, chuma, mbili-glazed,dirisha muafaka, casement, chuma,dirisha muafaka, ukanda, chuma,dirisha muafaka, gundi laminated mbao (glulam),dirisha muafaka, mbao, ukanda,dirisha muafaka, mbao, sliding,dirisha muafaka, mbao, madirisha kwa louvred,dirisha muafaka, mbao, kwa ajili ya taa paa na skylights,madirisha, composite plastiki zimeandaliwa,milango na madirisha, plastiki, wadudu screen,mlango na dirisha skrini, plastiki,mlango samani, plastiki,mlango padding, plastiki,dirisha uingizaji hewa mifumo, plastiki, watazamaji tu,paa mwanga insulation paneli, plastiki,muafaka, mlango na dirisha, plastiki,dirisha sills na mazingira, plastiki,sunblind kudhibiti viboko, plastiki,inashughulikia na hoods, plastiki, kwa ajili ya boti,roller shutters, chuma, moto sugu,blinds, wima, chuma,sunblinds, chuma slat,kupofua, dari, chuma,shutters na kupofua, mechanically kuendeshwa, chuma,shutters na kupofua, umeme kuendeshwa, chuma,moto mapazia, waya wenye matundu,pazia, chuma, kwa ajili ya meli,awnings na canopies, chuma,roller inashughulikia, kusuka polyester,roller blinds, filamu ya plastiki, kupambana na glare na ulinzi joto,canopies na sunblinds, plastiki,slats na vifaa, plastiki, kwa blinds roller,slats, plastiki, kwa blinds kiveneti na wima,milango, mbao, louvred,milango, mbao, uendeshaji,milango, mbao, bustani,milango, mbao, karakana,milango, mbao, patio,trapdoors, mbao,milango, mbao, yanazunguka,milango, mbao, swing,milango, mbao, sectional,milango, patio, plastiki,milango, swing, plastiki,milango na madirisha, conservatory, plastiki,madirisha, louvred, chuma,skylights, plastiki,paa taa, domes, plastiki,dirisha shutters, chuma,dirisha shutters, alumini,shutters roller, chuma,shutters, chuma, moto sugu,escalator roller shutters, kuzuia moto, chuma,shutters na kuacha mapazia, chuma,sehemu, plastiki, kwa shutters roller,mwongozo reli, plastiki, kwa shutters roller,taratibu, plastiki, kwa blinds roller na shutters,kiveneti blinds, chuma,kudhibiti nishati ya jua louvres na skrini, nje, alumini,blinds, kiveneti, plastiki,blinds, wima, plastiki.