装修建材板块12月12日跌0.21%，垒知集团领跌，主力资金净流入4720.89万元

Group 1 - The core point of the article indicates that the renovation and building materials sector experienced a decline of 0.21% on December 12, with the leading decline attributed to the company "Lai Zhi Group" [1] - On the same day, the Shanghai Composite Index closed at 3889.35, reflecting an increase of 0.41%, while the Shenzhen Component Index closed at 13258.33, showing an increase of 0.84% [1] Group 2 - In terms of capital flow, the renovation and building materials sector saw a net inflow of 47.21 million yuan from main funds, while speculative funds experienced a net outflow of 126 million yuan [2] - Retail investors contributed to a net inflow of 79.29 million yuan into the sector [2]